Metering system capable of realizing phase splitting function and intelligent electric energy meter system

Abstract

The invention relates to the field of intelligent power grid user side metering device application, and discloses a metering system capable of achieving a phase splitting function and an intelligent electric energy meter system, and the system comprises a metering unit which is used for being connected with a single-phase house-service line at the tail end of a power grid, so as to carry out the sampling and calculation of the incoming line voltage and incoming line current of the single-phase house-service line; the split-phase unit is used for being connected with a single-phase house-service line at the tail end of a power grid so as to convert single-phase alternating current of the single-phase house-service line into three-phase alternating current; the controller is connected with the metering unit and the phase splitting unit and used for carrying out phase locking on the three-phase alternating current according to the single-phase alternating current and adjusting the amplitude of the three-phase alternating current at the same time, so that the phase of the three-phase alternating current is synchronous with the phase of the incoming line voltage, and the phase splitting unit is used for splitting the phase of the three-phase alternating current. And the output current of the split-phase unit is adjusted according to the incoming current, so that the fluctuation of the output current is within a preset fluctuation range. According to the invention, the low-power and three-phase power utilization requirements of specific users are successfully met.

Description

Technical Field

[0001] The present invention relates to the application field of metering devices at the user side of smart grids, and particularly relates to a metering system and a smart electricity meter system that can implement a split-phase function. Background Art

[0002] Smart electricity meters are important tools for realizing refined management at the user side of power systems. Currently, the in-service smart electricity meters are mainly divided into single-phase smart electricity meters and three-phase smart electricity meters, which mainly realize the measurement and metering of user electricity consumption. In the current power grid marketing business strategy, single-phase smart electricity meters are mainly applied to users with electricity demand less than or equal to 12 kW (i.e., small-power users), while three-phase smart electricity meters are mainly applied to users with electricity demand greater than 12 kW. For some users with three-phase electricity demand but with electricity power less than 12 kW (i.e., large-power users), such as community domestic water pumps and small-power commercial cold storages, there is no specific smart electricity meter for adaptation, and only three-phase smart electricity meters can be used, resulting in waste of resources and an increase in the cost of power grid marketing business. Summary of the Invention

[0003] The present invention provides a metering system and a smart electricity meter system that can implement a split-phase function. Through innovative design, it effectively solves the problem that existing single-phase electricity meters cannot meet three-phase electricity demand, realizes accurate electricity metering, reduces operating costs, and improves power grid management efficiency.

[0004] The present invention is realized through the following technical solutions:

[0005] A metering system that can implement a split-phase function, the metering system includes:

[0006] A metering unit, used to connect to a single-phase incoming line at the end of the power grid to sample and calculate the incoming line voltage and incoming line current of the single-phase incoming line, so as to measure the electricity consumption of the load powered through the single-phase incoming line;

[0007] A split-phase unit, used to connect to a single-phase incoming line at the end of the power grid to realize converting the single-phase alternating current of the single-phase incoming line into three-phase alternating current;

[0008] A controller, respectively connected to the metering unit and the split-phase unit, used to perform phase locking on the three-phase alternating current according to the single-phase alternating current, and at the same time adjust the amplitude of the three-phase alternating current so that the phase of the three-phase alternating current is synchronized with the phase of the incoming line voltage, and adjust the output current of the split-phase unit according to the incoming line current so that the fluctuation of the output current is within a preset fluctuation range.

[0009] As an optimization, the phase splitting unit includes a current limiting protector, a rectifier bridge, a DC converter, and an inverter connected in series along the current direction. Among them, the current limiting protector is connected to the single-phase incoming line to prevent overcurrent;

[0010] The rectifier bridge is used to convert the single-phase alternating current into direct current;

[0011] The DC converter is used to adjust the amplitude of the direct current according to the controller;

[0012] There are two inverters. The two inverters are respectively connected to the DC converter and are used to convert the direct current into alternating current of the other two phases corresponding to the phase of the single-phase alternating current, so that the two alternating currents output by the two inverters and the single-phase alternating current jointly form three-phase alternating current, and the three-phase alternating current powers the load through the load socket.

[0013] As an optimization, the phase splitting unit further includes a voltage stabilizing capacitor and / or a filter. The voltage stabilizing capacitor is connected in series between the rectifier bridge and the DC converter. There are two filters, and the two filters are respectively arranged at the output ends of the inverters.

[0014] As an optimization, the current limiting protector is arranged on the live wire of the single-phase incoming line. The current limiting protector includes a current limiting inductor, a thyristor, and a current limiting resistor. The current limiting resistor is connected in parallel with the thyristor. The current limiting inductor is connected to the positive pole of the thyristor. The negative pole of the thyristor is connected to the rectifier bridge. The control pole of the thyristor is connected to the controller and is used to control the on and off states of the thyristor according to the incoming line current.

[0015] As an optimization, the metering system further includes an image acquisition unit, a calculation unit, and a switch unit, where

[0016] The image acquisition unit is used to acquire the standard power of the load to be carried;

[0017] The calculation unit calculates the operating current required by the load to be carried according to the standard power and the standard voltage, and outputs the calculated operating current to the controller. The controller judges whether to output a switch driving signal for controlling the opening and closing of the switch unit corresponding to the load to be carried based on the current limiting value of the electric energy meter, the operating current required by the load to be carried, and the preset conditions;

[0018] The switch unit is arranged between the filter and the load socket, and the switch unit is connected to the controller and is used to control the opening and closing state of the switch unit according to the switch driving signal, so as to control whether the load to be carried connected to the load socket is powered on.

[0019] As an optimization, at least one of the switch unit, the image acquisition unit, and the load socket strip is provided. If multiple switch units and load socket strips are provided, the switch unit controls at least one of the load socket strips.

[0020] As an optimization, the preset condition is specifically:

[0021] Calculate the difference between the current limiting value and the operating current required by the already loaded loads that have been metered by the electricity meter to obtain a first current difference;

[0022] Compare the operating current required by the to-be-loaded load with the first current difference. If the operating current required by the to-be-loaded load is less than the first current difference, the controller generates a switch drive signal and then proceeds to the next step. Otherwise, the controller does not generate a switch drive signal;

[0023] Insert the to-be-loaded load into the corresponding load socket strip to generate a trigger signal. After receiving the trigger signal, the controller sends the switch drive signal to the switch unit to make the switch unit close, and then recalculate the first current difference.

[0024] As an optimization, the image acquisition unit includes an acquisition camera and an identification model. The acquisition camera transmits the acquired image data to the identification model, and the identification model identifies the image data and outputs the identified standard power to the calculation unit.

[0025] The present invention also discloses an intelligent electricity meter system, including an electricity meter body and a load socket strip. The functional units of the foregoing metering system are installed in the electricity meter body or installed within a preset range from the electricity meter body to the load socket strip.

[0026] As an optimization, the functional unit includes a metering unit, a phase splitting unit, and a controller, and the metering unit, the phase splitting unit, and the controller are all installed in the electricity meter body; or, the functional unit includes a metering unit, a phase splitting unit, a controller, an image acquisition unit, a calculation unit, and a switch unit. Among them, the metering unit, the phase splitting unit, the controller, and the calculation unit are arranged in the electricity meter body, the image acquisition unit is arranged within a preset range from the load socket strip, and the switch unit is installed in the load socket strip or the switch unit is installed in the electricity meter body or the switch unit is installed on the line between the load socket strip and the electricity meter body.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] The present invention passes through a built-in split-phase module. With its small and portable design, it is applicable to various small-power three-phase devices and can successfully meet the needs of specific users for small-power three-phase electricity consumption. Description of the Drawings

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation on the embodiments of the present invention. In the drawings:

[0030] Figure 1 It is a schematic diagram of the module connection of a metering system capable of realizing the split-phase function described in Embodiment 1;

[0031] Figure 2 It is a schematic circuit diagram of a metering system capable of realizing the split-phase function described in Embodiment 1;

[0032] Figure 3 It is a schematic diagram of the module connection of a metering system capable of realizing the split-phase function described in Embodiment 2.

[0033] Markings in the drawings and corresponding component names:

[0034] 1 - Metering unit, 2 - Current-limiting protector, 3 - Rectifier bridge, 4 - Voltage-stabilizing capacitor, 5 - Controller, 6 - DC converter, 7 - Inverter, 8 - Filter, 9 - Load socket strip, 10 - Image acquisition unit, 11 - Calculation unit, 12 - Switch unit. Detailed Embodiments

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not constitute a limitation on the present invention.

[0036] Embodiment 1 of the present invention provides a metering system capable of realizing the split-phase function, as Figure 1 shown. The metering system includes a metering unit 1, a split-phase unit, and a controller 5.

[0037] The metering unit 1 is used to connect to the single-phase incoming line at the end of the power grid to sample and calculate the incoming line voltage and incoming line current of the single-phase incoming line, so as to measure the electricity consumption of the load powered through the single-phase incoming line.

[0038] The metering unit 1 is the acquisition and calculation unit 11 of the electric energy meter. As Figure 2 shown, the metering unit 1 respectively acquires the voltage of the single-phase incoming line (the black one is the neutral line, and the red one is the live line) (acquired through a voltage sensor), and acquires the current on the live line (acquired through a current sensor). The red live line is single-phase electricity.

[0039] The split-phase unit is used to connect to a single-phase incoming line at the end of the power grid to convert the single-phase alternating current of the single-phase incoming line into three-phase alternating current.

[0040] In some embodiments, the split-phase unit includes a current-limiting protector 2, a rectifier bridge 3, a DC converter 6, and an inverter 7 connected in series along the current direction. Among them, the current-limiting protector 2 is connected to the single-phase incoming line to prevent overcurrent;

[0041] The rectifier bridge 3 is used to convert the single-phase alternating current into direct current;

[0042] The DC converter 6 is used to adjust the amplitude of the direct current according to the controller 5;

[0043] There are two inverters 7. The two inverters 7 are respectively connected to the DC converter 6 and are used to convert the direct current into alternating current of the other two phases corresponding to the phase of the single-phase alternating current, so that the two alternating currents output by the two inverters 7 and the single-phase alternating current together form three-phase alternating current, and the three-phase alternating current powers the load through the load socket 9.

[0044] More specifically, the live wire is sequentially connected to the current-limiting protector 2, the rectifier bridge 3, the DC converter 6, and the inverter 7, and the neutral wire is directly connected to the rectifier bridge 3, the DC converter 6, and the inverter 7.

[0045] In some embodiments, the current-limiting protector 2 is arranged on the live wire of the single-phase incoming line. The current-limiting protector 2 includes a current-limiting inductor, a thyristor, and a current-limiting resistor. The current-limiting resistor is connected in parallel with the thyristor. The current-limiting inductor is connected to the positive pole of the thyristor. The negative pole of the thyristor is connected to the rectifier bridge 3, and the control pole of the thyristor is connected to the controller 5 to control the on and off states of the thyristor according to the incoming line current.

[0046] The controller 5 is respectively connected to the metering unit 1 and the split-phase unit, and is used to perform phase locking on the three-phase alternating current according to the single-phase alternating current, and at the same time adjust the amplitude of the three-phase alternating current so that the phase of the three-phase alternating current is synchronized with the phase of the incoming line voltage, and adjust the output current of the split-phase unit according to the incoming line current so that the fluctuation of the output current is within a preset fluctuation range.

[0047] In some embodiments, the split-phase unit further includes a voltage-stabilizing capacitor 4 and / or a filter 8. The voltage-stabilizing capacitor 4 is connected in series between the rectifier bridge 3 and the DC converter 6. There are two filters 8, and the two filters 8 are respectively arranged at the output ends of the inverters 7.

[0048] Based on a single-phase diode full-bridge rectifier circuit (rectifier bridge 3) and a shunt voltage-regulating capacitor 4, a stable DC voltage source is obtained. Based on a DC converter 6, the output voltage of the DC power supply (i.e., the direct current output through the rectifier bridge 3) is regulated. Based on two groups of H-bridge inverters 7, two groups of stable AC power supplies are obtained and three-phase power supplies (i.e., three-phase alternating current) are output to the common power grid. The DC converter 6 - H-bridge inverter 7 adopts voltage closed-loop control to achieve the stability of the two-phase inverter voltage. At the front end of the circuit, based on a current-limiting inductor and a thyristor (current-limiting protector 2), the protection of the subsequent circuit and user equipment (load) is realized.

[0049] More specifically, the metering unit 1 can accurately measure the user's electricity consumption through the sampling and calculation of the incoming line voltage and current, and at the same time provide a circuit basis for the controller to lock the phase. The current-limiting protector 2 is composed of a series-parallel connection of a current-limiting inductor, a low-power thyristor, and a current-limiting resistor, which can effectively prevent overcurrent phenomena, ensure the safe and stable operation of the circuit, and at the same time the current-limiting inductor can have a good filtering effect on the input current. The rectifier bridge 3 (specifically a diode full-wave rectifier bridge) converts alternating current into direct current and provides a stable power supply basis for the subsequent circuit. The voltage-regulating capacitor 4 further smooths the DC voltage, avoids the influence of voltage fluctuations on the power supply output performance, and provides a stable DC voltage source for the subsequent circuit. The controller 5 provides control signals for the DC conversion, inversion, and circuit current-limiting protection of the main circuit through a voltage closed-loop control algorithm and a front-stage circuit protection strategy, accurately regulates the output of the DC converter - H-bridge inverter, and ensures the stability of the two-phase power supply; the DC converter 6 efficiently converts the DC voltage and adjusts the amplitude of the output voltage of the inverter power supply by adjusting the amplitude of the DC voltage to meet the output requirements of the three-phase power supply. The H-bridge inverter 7 based on IGBT accurately outputs two-phase alternating current with initial phases of +120° and -120°, ensuring the power quality in terms of the AC frequency; the output filter 7 filters out harmonics and improves the output voltage waveform to meet the requirements of power quality.

[0050] In the intelligent electricity meter of the present invention, a split-phase module is embedded, which can realize the output of three-phase power supplies that meet the load power quality requirements, meet the small-power three-phase electricity consumption needs. At the same time, it reduces equipment redundancy, realizes the accurate metering of user electricity consumption. Optimizes the resource allocation in the power grid marketing business, effectively reduces the business cost, and improves the intelligent level of power management.

[0051] Embodiment 2

[0052] On the basis of Embodiment 1, the metering system in Embodiment 2 further includes an image acquisition unit 10, a calculation unit 11, and a switch unit 12, as Figure 3 shown, where the image acquisition unit 10 is used to acquire the standard power of the load to be carried;

[0053] The calculation unit 11 calculates the operating current required by the load to be carried according to the standard power and the standard voltage, and outputs the calculated operating current to the controller 5. The controller 5 determines whether to output a switch driving signal for controlling the opening and closing of the switch unit 12 corresponding to the load to be carried based on the current limiting value of the watt-hour meter, the operating current required by the load to be carried, and a preset condition;

[0054] The switch unit 12 is arranged between the filter 8 and the load socket 9, and the switch unit 12 is connected to the controller 5, and is used to control the opening and closing state of the switch unit 12 according to the switch driving signal, so as to control whether the load to be carried connected to the load socket 9 is powered on.

[0055] In some embodiments, at least one of the switch unit 12, the image acquisition unit 10, and the load socket 9 is provided. If a plurality of the switch unit 12 and the load socket 9 are provided, the switch unit 12 controls at least one of the load sockets 9.

[0056] Preferably, one switch unit 12 corresponds to one load socket 9. The image acquisition unit 10 can be provided with a plurality of units or one unit. Providing a plurality of image acquisition units 10 can facilitate image acquisition of the nameplate of the load to be carried.

[0057] In some embodiments, the preset condition is specifically:

[0058] A1. Calculate the difference between the current limiting value and the operating current required by the already carried load that has been metered by the watt-hour meter to obtain a first current difference;

[0059] A2. Compare the operating current required by the load to be carried with the first current difference. If the operating current required by the load to be carried is less than the first current difference, the controller 5 generates a switch driving signal, and then proceeds to the next step. Otherwise, the controller 5 does not generate a switch driving signal;

[0060] A3. Insert the load to be carried into the corresponding load socket 9 to generate a trigger signal. After receiving the trigger signal, the controller 5 sends the switch driving signal to the switch unit 12, so that the switch unit 12 closes, and then recalculates the first current difference.

[0061] The function of the current limiting protector 2 is to cut off the circuit when the current exceeds the set value to protect the equipment and the circuit. Although the current limiting protector 2 is provided in the metering system, if the operating current of the metering system is too large, the current limiting protector 2 may be burned out.

[0062] A metering system can be connected to at least one load. If some loads have been connected to the metering system, these loads are recorded as the loaded loads. Also, since the starting current of motor devices such as water pumps and motors is much larger than the operating current, if the operating current is greater than the first current difference, then when such a motor device, as a load to be loaded, is to be connected to the circuit where the metering system is located, there is a great risk of burning out the circuit where the metering system is located. In this way, the operation of all the loads carried on this circuit will be affected.

[0063] To avoid this phenomenon, the present invention designs a preset condition. After calculating the surplus current (i.e., the first current difference) of the circuit where the metering system is located, then compare the magnitudes of the first current difference and the operating current of the load to be loaded. When the operating current of the load to be loaded is less than the first current difference, the controller 5 allows the output of a switch drive signal. When the load to be loaded is inserted into the load socket 9 and a trigger signal is generated, after the controller 5 receives the trigger signal, it then sends the switch drive signal to the switch unit 12 corresponding to this load socket 9. In this way, when there are multiple load sockets 9, any one of the load sockets 9 can be inserted, which can not only ensure that the switch drive signal can be sent to the corresponding switch unit 12, but also ensure that power is supplied to the load to be loaded after the load to be loaded is inserted into the load socket 9, and the load socket 9 without the load to be loaded will not have electricity, reducing the risk of electric shock caused by improper operation of non-normal operating staff and ensuring the safety of the staff.

[0064] The generation of the trigger signal can be achieved by the following means:

[0065] A sensor (which can be a pressure sensor or an infrared sensor) is provided on the surface of the load socket 9. When the connector of the load is inserted into the socket of the load socket 9, after the pressure sensor or the infrared sensor detects that the connector is inserted into the socket, the load socket 9 sends a trigger signal.

[0066] It should also be noted that the line for supplying power to the calculation unit 11 and the image acquisition unit 10 is also the single-phase incoming line in the present invention, and this single-phase incoming line is connected to the calculation unit 11 and the image acquisition unit 10 after being metered by the metering unit 1.

[0067] In some embodiments, the image acquisition unit 10 includes an acquisition camera and an identification model. The acquisition camera transmits the acquired image data to the identification model, and the identification model identifies the image data and outputs the identified standard power to the calculation unit 11.

[0068] The identification model can be a CNN model, and the image data acquired by the image acquisition unit 10 is the nameplate of the device, and the standard power is marked on the nameplate.

[0069] Use a partial image of the equipment nameplate as the training set and the other part as the test set. The actual standard power on the nameplate image serves as the actual label, and the output obtained by inputting the nameplate image into the CNN model is the predicted label.

[0070] The training of the CNN model is specifically achieved through an improved butterfly algorithm. The specific process is as follows:

[0071] S1. Define the objective function, which is the sum of the similarities between all actual labels and their corresponding predicted labels;

[0072] S2. Introduce fitness ranking in the global search stage of the original butterfly optimization algorithm to obtain an improved butterfly optimization algorithm with a faster convergence speed during the iteration process;

[0073] The specific formula for introducing fitness ranking in the global search stage of the original butterfly optimization algorithm is:

[0074]

[0075] where, represents the solution of the i-th butterfly individual in the (t + 1)-th iteration, represents the solution of the i-th butterfly individual in the t-th iteration; represents the fitness ranking of the i-th butterfly individual after the t-th update, and this fitness ranking is in descending order; N represents the number of butterfly individuals, and g * represents the global optimal solution; f(zi) represents the fragrance value of the i-th butterfly individual, and r is a random number in the range of [0, 1].

[0076] S3. Set the relevant parameters of the improved butterfly optimization algorithm and the number of butterfly individuals. Among them, the weights and thresholds in the CNN model together serve as a butterfly individual, and the fragrance of the butterfly individual is the sum of the similarities between all actual labels and their corresponding predicted labels;

[0077] S4. Set the fitness function;

[0078] S5. Calculate the fragrance of each butterfly individual based on the improved butterfly optimization algorithm and obtain the butterfly individual with the strongest fragrance;

[0079] S6. Iterate each butterfly individual based on the butterfly individual with the strongest fragrance through the improved butterfly optimization algorithm for local search or global search;

[0080] S7. Determine whether the maximum number of iterations or the convergence of the objective function is reached. If so, jump to S8; otherwise, return to S6;

[0081] S8. Output the CNN model with the optimal weights and thresholds as the recognition model.

[0082] Embodiment 3 discloses an intelligent electricity meter system, including an electricity meter body and a load socket 9. The functional units of the metering system described in Embodiment 1 are installed in the electricity meter body.

[0083] In some embodiments, the functional units include a metering unit 1, a phase splitting unit, and a controller 5. The metering unit 1, the phase splitting unit, and the controller 5 are all installed in the electricity meter body.

[0084] The specific installation method is common technical knowledge for those skilled in the art and will not be elaborated here.

[0085] Embodiment 4 discloses an intelligent electricity meter system, including an electricity meter body and a load socket 9. The functional units of the metering system described in Embodiment 2 are installed in the electricity meter body and within a preset range from the load socket 9.

[0086] In some embodiments, the functional units include a metering unit 1, a phase splitting unit, a controller 5, an image acquisition unit 10, a calculation unit 11, and a switch unit 12. Among them, the metering unit 1, the phase splitting unit, the controller 5, and the calculation unit 11 are arranged in the electricity meter body. The image acquisition unit 10 is arranged within a preset range from the load socket 9. The switch unit 12 is installed in the load socket 9, or the switch unit 12 is installed in the electricity meter body, or the switch unit 12 is installed on the line between the load socket 9 and the electricity meter body.

[0087] The image acquisition unit 10 may not be installed on the load socket 9, as long as it is near the load socket 9.

[0088] The above specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metering system capable of realizing the split-phase function, characterized in that The metering system includes: A metering unit, which is used to connect to the single-phase incoming line at the end of the power grid to sample and calculate the incoming line voltage and incoming line current of the single-phase incoming line, so as to measure the electricity consumption of the load powered through the single-phase incoming line; A phase splitting unit, which is used to connect to the single-phase incoming line at the end of the power grid to convert the single-phase alternating current of the single-phase incoming line into three-phase alternating current; A controller, which is respectively connected to the metering unit and the phase splitting unit, and is used to perform phase locking on the three-phase alternating current according to the single-phase alternating current, and at the same time adjust the amplitude of the three-phase alternating current so that the phase of the three-phase alternating current is synchronized with the phase of the incoming line voltage, and adjust the output current of the phase splitting unit according to the incoming line current so that the fluctuation of the output current is within a preset fluctuation range.

2. The metering system capable of realizing the split-phase function according to claim 1, characterized in that, The phase splitting unit includes a current limiting protector, a rectifier bridge, a DC converter and an inverter connected in series along the current direction. Among them, the current limiting protector is connected to the single-phase incoming line and is used to prevent overcurrent; The rectifier bridge is used to convert the single-phase alternating current into direct current; The DC converter is used to adjust the amplitude of the direct current according to the controller; There are two inverters. The two inverters are respectively connected to the DC converter and are used to convert the direct current into alternating current of the other two phases corresponding to the phase of the single-phase alternating current, so that the two alternating currents output by the two inverters and the single-phase alternating current together form three-phase alternating current, and the three-phase alternating current powers the load through a load socket.

3. The metering system capable of realizing the split-phase function according to claim 2, characterized in that, The phase splitting unit further includes a voltage stabilizing capacitor and / or a filter. The voltage stabilizing capacitor is connected in series between the rectifier bridge and the DC converter. There are two filters, and the two filters are respectively arranged at the output ends of the inverters.

4. The metering system capable of realizing the split-phase function according to claim 2, characterized in that, The current limiting protector is arranged on the live wire of the single-phase incoming line. The current limiting protector includes a current limiting inductor, a thyristor and a current limiting resistor. The current limiting resistor is connected in parallel with the thyristor. The current limiting inductor is connected to the positive electrode of the thyristor. The negative electrode of the thyristor is connected to the rectifier bridge. The control electrode of the thyristor is connected to the controller and is used to control the on and off states of the thyristor according to the incoming line current.

5. A metering system capable of achieving a split-phase function according to any one of claims 1-4, characterized in that, The metering system further includes an image acquisition unit, a calculation unit and a switch unit. Among them, The image acquisition unit is used to acquire the standard power of the load to be carried; The calculation unit calculates the operating current required by the load to be carried according to the standard power and the standard voltage, and outputs the calculated operating current to the controller. The controller judges whether to output a switch driving signal for controlling the opening and closing of the switch unit corresponding to the load to be carried based on the current limiting value of the electric energy meter, the operating current required by the load to be carried and a preset condition; The switch unit is arranged between the filter and the load socket, and the switch unit is connected to the controller and is used to control the opening and closing state of the switch unit according to the switch driving signal, so as to control whether the load to be carried connected to the load socket is powered on.

6. The metering system capable of realizing the split-phase function according to claim 5, characterized in that, The switch unit, the image acquisition unit, and the load socket strip are each provided with at least one. If multiple switch units and multiple load socket strips are provided, the switch unit controls at least one of the load socket strips.

7. The metering system capable of realizing the split-phase function according to claim 6, wherein, The preset condition is specifically: Calculate the difference between the current limiting value and the operating current required for the already-mounted load that has been metered by the electricity meter to obtain a first current difference. Compare the operating current required for the to-be-mounted load with the first current difference. If the operating current required for the to-be-mounted load is less than the first current difference, the controller generates a switch drive signal and then proceeds to the next step; otherwise, the controller does not generate a switch drive signal. Insert the to-be-mounted load into the corresponding load socket strip to generate a trigger signal. After receiving the trigger signal, the controller sends the switch drive signal to the switch unit to cause the switch unit to close, and then recalculate the first current difference.

8. A metering system capable of realizing a split-phase function according to claim 5, wherein, The image acquisition unit includes an acquisition camera and an identification model. The acquisition camera transmits the acquired image data to the identification model, and the identification model identifies the image data and outputs the identified standard power to the calculation unit.

9. An intelligent electric energy meter system, comprising an electric energy meter body and a load socket strip, characterized in that, The functional unit of the metering system according to any one of claims 1-4 is installed in the electricity meter body, or the functional unit of the metering system according to any one of claims 5-8 is installed in the electricity meter body and within a preset range from the load socket strip.

10. An intelligent electricity meter system according to claim 9, characterized in that, The functional unit includes a metering unit, a phase splitting unit, and a controller, and the metering unit, the phase splitting unit, and the controller are all installed in the electricity meter body; or, the functional unit includes a metering unit, a phase splitting unit, a controller, an image acquisition unit, a calculation unit, and a switch unit. Among them, the metering unit, the phase splitting unit, the controller, and the calculation unit are provided in the electricity meter body, the image acquisition unit is provided within a preset range from the load socket strip, and the switch unit is installed in the load socket strip or the switch unit is installed in the electricity meter body or the switch unit is installed on the line between the load socket strip and the electricity meter body.

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